( 182 ) 



Cf Oi 0,1 ^^ö 0^^ os ü,ó OY O,^ OO '/^ 

 Ether. X Anllii'tKiiiinont'. 



A' 



isollKM'iii of soliihilily sliows slill clcjii-ly llio |>lieHonieiioii of rolrngradc 

 solitlilifatioii. 



At a still liiü,ii(M' loiiipoi-aliirc the i-(\i>ion of rel roiii'adc condensation 

 becomes orealcr and urealer, so llial al "270' we uet a y^-.r-section 

 like tlial drawn in li,U'. 'Ic. 



The relrograde condensation is here verv stronii," and nn(h»nl)tedly 

 ranges over more ihan 40 atm. A relrograde condensation of sncli 

 strength, however, conld nol he observed becanse the vobune of Ihe 

 compi'ession tube was loo small; the strongest retrograde condensation 

 observed bv me co\'ered a range of pressnre from 55 lo 39, of 1(^ 

 atmospheres Iherefoi-e. The small volnme of the tnbe prevented ns from 

 obsei'ving whelher any retrograde solidification still existed at '270''. 

 As, however, it is not \ery probable that we still shonld have retro- 

 grade solidification here, it is not represented in the fignre. 



Above the melting-point of anthraqninone (283") the retrograde 

 condensation is enormons, so that 1 conld observe it at 290° over a 

 pressnre-range of 83 to 40 atmospheres. 



Fnrther 1 mention that most of the /)-.i'-sections are crossed in 



